CHEM 1000 Lecture Notes - Lattice Energy, Ionic Compound, Silicon Carbide

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29 Jan 2013
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Q1. Network Covalent Solids (Medium)
True or False - Network covalent solids
a) Network covalent solids involve substances with
covalent bonds extending throughout their crystalline
structure.
b) Diamond and silicon carbide are both examples of
substances with weak intermolecular forces.
c) The sp2 orbitals linking the carbons together in
graphite creates a strong link between the layers of carbon,
making graphite a weak lubricant.
d) Graphite and diamonds are both good conductors
of electricity. (diamond is not because all its valence
electrons are involved in localized or permanently fixed into
single covalent bond).
e) Lattice energy is the energy given off when a solid
compound breaks into its ionic components when added to
water.
f) The attractive forces between a pair of oppositely
charged ions increases with increased charge on the ions
and with decreased ionic sizes.
g) The higher the lattice energy the lower the melting
point.
h) The lower the lattice energy, the greater the quantity
if an ionic solid that can be dissolved in a given quantity of
solvent.
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